I am interested in multibooting Ubuntu and OpenBSD. I did read the section on the faq, but I was really interested in, was finding out if it's possible to use full disk encryption with two operating systems installed, or at least have them both installations encrypted separately?

I don't actually have that system any more but it was fairly simple: a 512MiB EFI system partition (type "ef00" in gdisk, FAT32-formatted), a standard GNU/Linux partition (type "8300", btrfs) and an OpenBSD disklabel ("a600").

The OpenBSD installer used the pre-existing ESP as /dev/sd0i

Last edited by Head_on_a_Stick; 3rd June 2017 at 03:16 AM.
Reason: corrected GNU/Linux partition code (8200 is for swap).

I currently dual boot Slackware64-current and OpenBSD 6.1. Lilo is installed to the MBR. I put the following addition at the tail end of /etc/lilo.conf. This assumes that swap is sda1, / is sda2, /home is /dev/sda3, and OpenBSD is on /dev/sda4.